Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff84ef6a25f2bf6…

MALICIOUS

PDF

35.8 KB Created: 2021-07-05 23:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 58a9fa47d6a798112beaa3310e92b094 SHA-1: 449443c3d5b67906f40002b12dbb2998b451dff8 SHA-256: cff84ef6a25f2bf6d83ef6940e9ea7318c6fee9c0e10f774d6ff6ae0600c01b9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to websites and other PDFs that promise free in-game currency or hacks for popular games like Roblox and Coin Master. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution scheme. The document body and heuristics indicate a lure designed to trick users into visiting these sites, which likely host further malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/roblox36com-free-robux-game-hack In PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/gift-robux-free_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/roblox-pastebin-free-robux_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/roblox-alien-simolator-hack-script_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/free-roblox-gui-place_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://wavestelecom.net/uploaded_files/userfiles/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003491.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3491 22268 bytes
SHA-256: 3ca3ff71ab73a09b59fee54c26d2e69ef2aece718dc5a08bbc7090770ebcd26a
font_01_sfnt_off000065d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D5 19392 bytes
SHA-256: f5d8fb1e1227d04f94fc2588cf3bb8579c3297dc080a6331d916c9c738f57d9e

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